That's not exactly unimportant.  The RME Hammerfall DSP contains a
cross-bar configuration with lots of inputs and outputs.  The crossbar
is initialized to zeros by default (usual safety measure).  When using
the Hammerfall for sound output, one needs to open more than just the
volume control for PCM output: one needs to route the output to some
physical output via the crossbar as well.

The only user-available application for doing that is hdspmixer.
Without hdspmixer, the soundcard is basically useless.

There is an obscure way for using alsactl for accessing crossbar
elements write-only.  But that is only accessible to scripts and the
command line (or C programming).

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https://bugs.launchpad.net/bugs/723276

Title:
  /usr/bin/hdspmixer is missing

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